New features:
Browser viewer: Allow customizing what information is displayed in the header and footer areas. Access Preferences from the viewer controls to change.
Add support for MTP devices on FreeBSD.
ToC editor: Add more case changing operations to the right click menu.
Content server: Redirect pre 2.x book URLs to new 3.x URLs via a redirect.
Content server: Allow opening entries in the book list in a new tab via middle click/right click.
Add a tweak in Preferences->;Tweaks to exclude some fields when using the Edit metadata->;Copy/paste actions.
Linux: Allow using calibre-tray.png in the calibre resources folder to override the system tray icon.
Bug fixes:
Browser viewer: Fix goto next/previous section actions not working when the sections are in different individual HTML files.
Edit book/Book polishing: When compressing images and the compressed image is larger thant he original, use the original image.
PDF input: Fix conversion of multi-level PDF Outline causing duplicate entries in the Table of Contents.
Edit book: Fix incorrect EPUB 3 declarations being added to the OPF file when adding covers to an EPUB 2 book.
Edit book: Fix backspace key un-indenting instead of deleting even when text is selected if the is at the start of the line.
Tag browser: Fix position not bing preserved when deleting books.
Edit Book: Use the cache directory rather than the temp directory to store working files. Hopefully prevents temp file cleaners from destroying books.
EPUB input: Handle books that erroneously set the mimetype for font files to text/plain.
AZW3 input: Do not fail to process files with invalid internal flow references.
When updating plugins, do not show the dialog asking which toolbar to put the plugin, even if the user has removed the plugin for all toolbars.
Content server: Fix using the Clear logs button preventing the server from restarting until calibre itself is restarted.
Improved news sources:
LA Times.
Popular Science.
Nikkei News.